In a large mixing bowl, combine the cooked pasta, diced chicken, and broccoli florets.
Add the drained diced tomatoes, garlic powder, onion powder, Italian seasoning, and salt and pepper. Mix well to ensure all the ingredients are evenly combined.
In a separate bowl, whisk together the heavy cream and half of the cheddar and mozzarella cheese. Pour this mixture over the pasta and chicken mixture, stirring gently until everything is well coated.
Transfer the mixture into a greased 9x13 inch baking dish.
Top with the remaining cheese and sprinkle the breadcrumbs evenly across the top. Drizzle olive oil over the breadcrumbs for added crunch and flavor.
Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbling and golden brown on top.
Remove from the oven and allow to cool for 5 minutes before serving.
Notes
Serve in individual bowls garnished with freshly chopped parsley or basil.